﻿using System;
using System.IO;
using System.IO.Compression;
using System.Text;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using Xpedite.Resources.Compressors;

/* Copyright (c) 2010 CBaxter
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), 
 * to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, 
 * and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 
 * IN THE SOFTWARE. 
 */

namespace Xpedite.Test.Resources.Compressors
{
  [TestClass]
  public class GZipCompressorTest
  {
    [TestMethod]
    public void TestHasContentEncodingIsTrue()
    {
      Assert.IsTrue(new GZipCompressor().HasContentEncoding);
    }

    [TestMethod]
    public void TestContentEncodingGZip()
    {
      Assert.AreEqual(AcceptEncodings.GZip, new GZipCompressor().ContentEncoding);
    }

    [TestMethod]
    public void TestEncodingGZip()
    {
      String content = "My compressable content";
      Byte[] contentBytes = Encoding.UTF8.GetBytes(content);

      var compressedBytes = new GZipCompressor().Compress(contentBytes);

      Assert.AreNotSame(contentBytes, compressedBytes);
      Assert.AreEqual(content, Encoding.UTF8.GetString(Decompress(compressedBytes)));
    }

    private static Byte[] Decompress(Byte[] bytes)
    {
      using (var compressedStream = new MemoryStream(bytes, false))
      using (var decompressedStream = new MemoryStream())
      {
        using (var gzipStream = new GZipStream(compressedStream, CompressionMode.Decompress))
          gzipStream.CopyTo(decompressedStream);

        return decompressedStream.ToArray();
      }
    }
  }
}
